Answer:
Kings and queens may cling to power and the jesters may have their call. I am the most common but I can rule them all. What am I?
I have all the knowledge you have. But I am so small that I can fit into your hands. What am I?
What has 3 feet but no toes?
I start with T end with T and within me is T.
Never ahead, ever behind, yet flying swiftly past; for a child, I last forever; for an adult, I'm gone too fast. What am I?
Give it food and it will live, give it water and it will die.